X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from imo-d22.mx.aol.com ([205.188.144.208] verified) by logan.com (CommuniGate Pro SMTP 5.0.6) with ESMTP id 933147 for flyrotary@lancaironline.net; Thu, 19 Jan 2006 15:57:00 -0500 Received-SPF: pass receiver=logan.com; client-ip=205.188.144.208; envelope-from=WRJJRS@aol.com Received: from WRJJRS@aol.com by imo-d22.mx.aol.com (mail_out_v38_r6.3.) id q.274.450799c (15974) for ; Thu, 19 Jan 2006 15:56:10 -0500 (EST) Received: from mblk-r33 (mblk-r33.mblk.aol.com [152.163.179.23]) by air-id10.mx.aol.com (v108_r1_b1.2) with ESMTP id MAILINID101-3e6643cffcea30b; Thu, 19 Jan 2006 15:56:10 -0500 Date: Thu, 19 Jan 2006 15:56:10 -0500 Message-Id: <8C7EB51E9380A5F-7F4-3AF6@mblk-r33.sysops.aol.com> From: wrjjrs@aol.com References: Received: from 66.127.99.234 by mblk-r33.sysops.aol.com (152.163.179.23) with HTTP (WebMailUI); Thu, 19 Jan 2006 15:56:10 -0500 X-MB-Message-Source: WebUI X-MB-Message-Type: User In-Reply-To: X-Mailer: AOL WebMail 15106 Subject: Re: [FlyRotary] Spark Plug Fouling Content-Type: multipart/alternative; boundary="--------MailBlocks_8C7EB51E9380A5F_7F4_38BE_mblk-r33.sysops.aol.com" MIME-Version: 1.0 To: flyrotary@lancaironline.net X-AOL-IP: 152.163.179.23 X-Spam-Flag: NO ----------MailBlocks_8C7EB51E9380A5F_7F4_38BE_mblk-r33.sysops.aol.com Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Ed, That is very useful information. On our water cooled engines the only time w= e'll see 350=B0 is just before the engine siezes! Bill Jepson=20 =20 -----Original Message----- From: Ed Anderson To: Rotary motors in aircraft Sent: Thu, 19 Jan 2006 12:54:32 -0500 Subject: [FlyRotary] Spark Plug Fouling I believe that most of us understood that leaded gasoline can lead to spark=20= plug fouling. It turns out even with the "Scavenger" compounds it apparent= ly will still happened. See article below: =20 I also read one report that address aircraft engine effect. It basically sa= id that if the CHT is not kept over 350F the scavenger effectiveness is mini= mal. So this may be why aircraft sparkplugs do not seem to foul as often as= the auto plugs (higher CHT). =20 =20 =20 URL :http://www.petroleumbazaar.com/MS/msappli2.htm =20 =20 During combustion TEL (Tetraethyl lead ) forms an oxide of lead which is not= volatile and so should tend to deposit on the combustion chamber, valves, s= park plugs, etc. with harmful effects. To counteract this. "Scavenger" compo= unds, such as ethylene dibromide and ethylene dichloride, are mixed with TEL= so that on combustion more volatile compounds of lead are formed, resulting= in most of the metal passing out with exhaust gas. The TEL together with th= e scavengers and a dye to indicate the poisonous nature of the compound is k= nown as "ethyl fluid".=20 =20 =20 Despite the use of decavenger compounds, it can give rise to such difficulti= es as: sparkplug fouling, surface ignition, exhaust valve failure and octane= requirement increase. =20 =20 Ed Anderson Rv-6A N494BW Rotary Powered Matthews, NC eanderson@carolina.rr.com ----------MailBlocks_8C7EB51E9380A5F_7F4_38BE_mblk-r33.sysops.aol.com Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Ed,

That is very useful information. On our water cooled engines the only t= ime we'll see 350=B0 is just before the engine siezes!

Bill Jepson

-----Original Message-----
From: Ed= Anderson <eanderson@carolina.rr.com>
To: Rotary motors in aircraft= <flyrotary@lancaironline.net>
Sent: Thu, 19 Jan 2006 12:54:32 -050= 0
Subject: [FlyRotary] Spark Plug Fouling

I believe that most of us understood that leaded gas= oline can lead to spark plug fouling. It turns out even with the= "Scavenger" compounds it apparently will still happened. See article=20= below:

I also read one report that address aircraft engine=20= effect. It basically said that if the CHT is not kept over 350F the sc= avenger effectiveness is minimal. So this may be why aircraft sparkplu= gs do not seem to foul as often as the auto plugs (higher CHT).

URL :http://www.petroleumbazaar.com/MS/msap= pli2.htm

During combustion TEL (Tetraethyl lead = ;) forms an oxide of lead which is not volatile and so should tend to d= eposit on the combustion chamber, valves, spark plugs, etc. with harmful eff= ects. To counteract this. "Scavenger" compounds, such as ethylene dibromide=20= and ethylene dichloride, are mixed with TEL so that on combustion more volat= ile compounds of lead are formed, resulting in most of the metal passing out= with exhaust gas. The TEL together with=20= the scavengers and a dye to indicate the poisonous nature of the compound is= known as "ethyl fluid".

Despite the use of decavenger compounds, it= can give rise to such difficulties as: sparkplug fouling, surface ignition,= exhaust valve failure and octane requirement increase.

Ed Anderson
Rv-6A N494BW Rotary Powered
Matthe= ws, NC
eanderson@carolina.rr.com

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